منابع مشابه
Gold Standard Gravity
This paper provides striking confirmation of the restrictions of the structural gravity model of trade. Structural forces predicted by theory explain 95% of the variation of the fixed effects used to control for them in the recent gravity literature, fixed effects that in principle could reflect other forces. This validation opens avenues to inferring unobserved sectoral activity and multilater...
متن کاملPeer Review: Publication’s Gold Standard
• Brief, comprehensive summary of article contents • Written in clear, concise language • Includes the most important concepts, findings, implications • Usually the first article contact for readers
متن کامل'Gold Standard' for Vascular Imaging
uring the last several years, dramatic developD ments have taken place in the area of cardiac imaging techniques. From an era of imaging by silhouettes (chest roentgenography, fluoroscopy, angiocardiography, angiography), we have emerged into an era of imaging by tomographic scanning (echocardiography, radionuclide and computed tomography, magnetic resonance).l-3 Two-dimensional intravascular e...
متن کاملThe Gold Standard in Corpus Annotation
Trustworthy corpora are necessary for training and meaningful evaluation of algorithms which use annotations. These standard collections are called Gold Standard Corpora (GSC). However the construction of GSC is a laborious and time-consuming process and size, quality and most of all availability of task-specific GSC directly influence the development of machine learning based natural language ...
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The many benefits of urea as a topical treatment for skin conditions have long been known particularly as an additive to emollient preparations. In podiatry, we have observed a renaissance with an increase in new products coming to market promoted as containing urea. Recent research has begun to unravel its biochemical benefits in treating dry skin conditions. This article reviews the chemical ...
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ژورنال
عنوان ژورنال: Nature
سال: 1981
ISSN: 0028-0836,1476-4687
DOI: 10.1038/294008c0